HAProxy is frequently used as a load-balancer in front of a Galera cluster. While diagnosing an issue with HAProxy configuration, I realized that logging doesn’t work out of the box on CentOS 6.5. Here is a simple recipe to fix the issue.
If you look at the top of /etc/haproxy/haproxy.cfg,
you will see something like:
global
log 127.0.0.1 local2
[...]
This means that HAProxy will send its messages to rsyslog on 127.0.0.1. But by default, rsyslog doesn’t listen on any address, hence the issue.
Let’s edit /etc/rsyslog.conf and uncomment these
lines:
$ModLoad imudp $UDPServerRun 514
This will make rsyslog listen on UDP port 514 for all IP addresses. Optionally you can limit to 127.0.0.1 by adding:
$UDPServerAddress …[Read more]